PHOENIX -- Peter O'Brien hit his way into the Major Leagues last month. He didn't do enough of that in his three weeks with the D-backs and now, the outfielder is on his way back to Triple-A Reno.
O'Brien was optioned before Monday's game against the Padres to make room for shortstop Nick Ahmed, who returned from paternity leave. The D-backs opted to keep nine relievers in their bullpen for the series opener against San Diego, though Daniel Hudson will be going on the bereavement list Tuesday.
When O'Brien was called up on June 10, he had his first opportunity to get consistent at-bats in the Majors.